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UNITED STATES PATENT? OFFICE No Drawing. Application November 12, 1932,Serial No. 642,461

4 Claims.

The present invention relates to a textile treating process, and itparticularly relates to a process for pre-shrinking textiles of cottonor similar materials.

As is widely known, cotton textile products, parof ammonium alum and to3 ounces of sodium bisulphite utilized to from 10 to ounces of water.

A striking advantage residing in the process of the present inventionresides in the fact that tioularly washable garments made of cotton,tend it is only necessary to heat the bath to a temto shrink anddecrease in size incident to each perature approaching boiling for arelatively washing and cleansing operation. This shrinkage short period.In one example, the cotton piece frequently continues over long periodsof time and goods was satisfactorily processed when heated as a resultthe cotton garment or clothing article decreases in size to such adegree that it must be discarded by the possessor thereof.

Many attempts have been made to shrink cotton goods or garments beforeretail sale, and alin the bath to 180 to 190 F. and after a two hoursoaking. However, the temperature of treatment may be varied from 150 to210 F. and from 1 to 10 hours as may be found most desirable.

After soaking, the material is removed from though partial pro-shrinkingis widely attained, the bath, the liquids are removed by pressing acomplete pre-shrinking has not been readily and/or centrifuging and arethen dried. Alcommercially achieved. Such complete shrinking thoughgenerally not included in the preferred processes involve drasticchemical treatments and processes, other alums may be substituted forprocessing which not only were expensive but ammonium alum in certaincases as may also often resulted in deterioration of the textilematerial.

An object of the present invention is to provide a lore-shrinkingprocess for cotton piece goods which will assure' substantially completepre-shrinking of such goods on a commercially economical basis withoutdrastic chemical treatments.

Other objects will appear during the course of the followingspecification.

It has been found that if a relatively small amount of ammonium alum andsodium bisulphite are utilized in the pre-shrinking bath extraordinarysurprising results are obtained. Although ammonium alum or ammoniumaluminum sulphate will cause a slight shrinking of cotton piece goodswhen utilized by itself, when sodium bisulphite is included, thisshrinking becomes suprisingly complete without any noticeabledeterioracertain other reducing sulphur acids, such as sodium sulphiteand/ or sodium hydrosulphite.

In general, baths containing aluminum sulphate or alums when combinedwith reducing sulphur acid salts, appear to have the most satisfactoryeffects.

It is obvious that the above described invention may be widely varied indetails and many different embodiments thereof may be devised. It istherefore intended that the invention may be only restricted by thescope of the appended claims.

What is claimed is:

1. A process of pre-shrinking cotton piece goods which comprisesimmersing them in a bath containing dissolved ammonium alum and sodiumbisulphite.

'2. A process of pre-shrinking cotton piece goods which comprisesimmersing them in a heated tion of the piece goods. The sodiumbisulphite in b th containing ammonium alum and sodium addition tocatalyzing the action of the ammonium bisulphite for from 1 to 6 hours.alum oath; p gg dsal aa for 3. A process of pre-shrinking cotton piecegoods its leafl ns ai tan With the which comprises subjecting thematerial to treatresult that simul a eous Shrinking and DFEQQQL ment ina bath containing 20 parts of water, 2 are..nossiblel Exactlywhat'oausefilfi m hSt fi parts of ammonium alum, and 1 part of sodiumvantageous combined action of ammonium alum bisulphite, heating the bathto 180 to 190 F., and Sodiu bisulphite is not readily pp but continuingthe soaking for two hours and then it must be S hi Closely ed p With tremoving the piece goods from thebath and dryproperties and character ofthe cellulose fiber ing th constituting the base of the cotton material.4, A pre-shrinking bath for cotton textile math u h the Composition othe bath may b terials comprising an aqueous solution containing widelyvaried, in one instance it has been found 20 parts of water, 2 parts ofammonium alum and very satisfactory to utilize 20 parts of water, 2 1part of sodium bisulphite. parts of ammonium alum and 1 part of sodiumbisulphite. This composition may be conveniently varied so that therewill be between 1 to 4 ounces EMANUEL BROOKS.

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